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Hello

Now 2 months left and i've encountered this problem
please im looking for a solution

Your sitemap appears to load correctly for me.

Is your server blocking google IPs?

actully i do not know
because it was working, but when he transfer my forums to this server , i encountered this problem

please , what should i tell to my host to solve this issue ?

I would ask if they are blocking any ip ranges that are from google or any other firewall/etc level blocks on the network or server.

I had the same problem. it was some type of proxy server used by my provider (hostican). I changed to 1and1 and the first day Google started indexing me. Thanks to the vBSEO support who diagnosed the trouble for me.